Considering your wonderful current selection of calibers and type of firearms, this is my suggestion to fill in the "gaps" :
#1 a dainty 20 gauge to play with spurfowl
#2 a good looking Savage 99 in .300
#3 Find a pre-64 .300 H&H
20 ga is made for the uplands, just wonderful to carry all day behind a brace of pointing dogs.
I've owned a .257 Roberts, Liked it, but your 6.5mm's will do the same job, a little better
I've owned a couple of .250 Savage M99's, and ammunition availability and the original limits of rifling twist to light 87 gr. bullets makes that choice problematic for pig hunts. 300 or .308 is a better choice.
A 300 H&H M70 is like gold, pick it up when you find it, but don't hold your breath ;-)
have fun shopping!